Number Series Questions for IBPS SO Set-2 PDF
Download Number Series Questions Set-2 PDF
Question 1: Instructions: In the following number series only one number is wrong. Find out the wrong number.
7, 12, 40, 222, 1742, 17390, 208608
a) 7
b) 12
c) 40
d) 1742
e) 208608
Question 2: Instructions: In the following number series only one number is wrong. Find out the wrong number.
6, 91, 584, 2935, 11756, 35277, 70558
a) 91
b) 70558
c) 584
d) 2935
e) 35277
Question 3: Instructions: In the following number series only one number is wrong. Find out the wrong number.
9050, 5675, 3478, 2147, 1418, 1077, 950
a) 3478
b) 1418
c) 5673
d) 2147
e) 1077
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Question 4: Instructions: In the following number series only one number is wrong. Find out the wrong number.
1, 4, 25, 256, 3125, 46656, 823543
a) 3125
b) 823543
c) 46656
d) 25
e) 256
Question 5: Instructions: In the following number series only one number is wrong. Find out the wrong number.
8424, 4212, 2106, 1051, 526.5, 263.25, 131.625
a) 131.625
b) 1051
c) 4212
d) 8424
e) 263.25
InstructionsInstructions: In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number.
Question 6: 5531 5506 5425 5304 5135 4910 4621
a) 5531
b) 5425
c) 4621
d) 5135
e) 5506
Question 7: 6 7 9 13 26 37 68
a) 7
b) 26
c) 69
d) 37
e) 9
Question 8: 1 3 10 36 152 760 4632
a) 3
b) 36
c) 4632
d) 760
e) 152
Question 9: 4 3 9 34 96 219 435
a) 4
b) 9
c) 34
d) 435
e) 219
Question 10: 157.5 45 15 6 3 2 1
a) 1
b) 2
c) 6
d) 157.5
e) 45
Instructions
Find the wrong number in given series sequence.
Question 11: 1, 4, 15, 64 325, 1955
a) 15
b) 64
c) 325
d) 1955
e) None of these
Question 12: 6, 12, 21, 33, 49, 66
a) 21
b) 33
c) 49
d) 66
e) None of these
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Question 13: 6, 11.5, 19, 28.5, 41
a) 6
b) 11.5
c) 41
d) 28.5
e) None of these
Question 14: 5, 26, 82, 214, 401, 702
a) 26
b) 82
c) 214
d) 401
e) None of these
Question 15: 5,20,73,274,1049
a) 20
b) 73
c) 274
d) 1049
e) None of these
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Answers & Solutions:
1) Answer (D)
(7-1) x 2 = 12
(12 – 2) x 4 = 40
(40 – 3) x 6 = 222
(222 – 4) x 8 = 1744 ≠ 1742
(1744 – 5) x 10 = 17390
(17390 – 6) x 12 = 208608
2) Answer (C)
6 x 7 + 72 = 91 , 91 x 6 + 62 = 582 ≠ 584 , 582 x 5 + 52 = 2935,…
3) Answer (E)
9070 – 153 = 5675 , 5675 – 133 = 3478 , 3478 – 113 = 2147 , 2147 – 93 = 1418 , 1418 – 73 = 1075 ≠ 1077 , 1075 – 53 = 950
4) Answer (D)
11 = 1 , 22 = 4 , 33 = 27 ≠ 25 , 44 = 256 , 55 = 3125 , 66 = 46656 , 77 = 823543
5) Answer (B)
$\frac{8424}{2}$ = 4212
$\frac{4212}{2}$ = 2106
$\frac{2106}{2}$ = 1053 ≠ 1051
$\frac{1051}{2}$ = 526.5
$\frac{525.5}{2}$ = 263.25
$\frac{263.25}{2}$ = 131.625
6) Answer (A)
5531 – 52 = 5506
5506 – 92 = 5425
5425 – 112 = 5304
5134 – 132 = 5135
5135 – 152 = 4910
4910 – 172 = 4621
Ever number after 5531 has a difference of a square.
Hence 5531 is the wrong number.
7) Answer (B)
This should be the series.
6 + 1 = 7
7 + 2 = 9
9 + 4 = 13
13 + 8= 21
21 + 16 = 37
37 + 32 = 69
Hence, we can say that 26 is incorrect.
8) Answer (D)
(1 x 1) + 2 = 3
(3 x 2) + 4 = 10
(10 x 3) + 6 = 36
(36 x 4) + 8 = 152
(152 x 5) + 10 = 770 ≠760
(770 x 6) + 12 = 4632
9) Answer (D)
02 + 4 = 4
12 + 2 = 3
32 + 0 = 9
62 – 2 = 34
102 – 4 = 96
152 – 6 = 219
212 – 8 = 433 ≠ 435
10) Answer (A)
157.5 ÷ 3.5 = 45
45 ÷ 3 = 15
15 ÷ 2.5 = 6
6 ÷ 2 = 3
3 ÷ 1.5 = 2
2 ÷ 1 = 2 ≠ 1
11) Answer (D)
4 = 1*2+2 ; 15 = 4*3+3 ; 64 = 15*4+4 ; 325 = 64*5+5 ; 1956 = 325*6+6
The nth term is of the form,
$T_n=(T_{n-1}\times n)+n$
The last term does not follow the pattern and is thus the wrong number in the sequence.
12) Answer (C)
2*2+2 = 6 ; 3*3+3 = 12 ; 4*4 + 5= 21 ; 5*5 +8 = 33 ; 6*6 + 12 = 48
13) Answer (C)
1.5*2 + 3 = 6
2.5*3 + 4 = 11.5
3.5*4 + 5 = 19
4.5*5 + 6 = 28.5
5.5*6 + 7 = 40
14) Answer (C)
1*2+3=5 ; 4*5+6 = 26 ; 8*9+10 = 82 ; 13*14+15 = 212 ; 19*20 + 21 =401 ; 26*27 +28 = 702
15) Answer (C)
1^2 + 4= 5 ; 2^2 + 16 = 20 ; 3^2 + 64 = 73 ; 4^2 + 256 = 272 ; 5^2 + 1024 = 1049